CBSE Questions for Class 12 Engineering Chemistry The D-And F-Block Elements Quiz 6 - MCQExams.com

More number of oxidation states are exhibited by the actinoids than by lanthanoids. The main reason for this is:
  • greater metallic character of the lanthanoids than that of the corresponding actinoids.
  • more active nature of the actinoids.
  • more energy difference $$5f$$ and $$6d$$-orbitals than that between $$4f$$ and $$5d$$-orbitals.
  • lesser energy difference between $$5f$$ and $$6d$$-orbitals than that between $$4f$$ and $$5d$$-orbitals.
Titanium shows magnetic moment of $$1.73BM$$; then find out its oxidation state:
  • $$+1$$
  • $$+4$$
  • $$+3$$
  • $$+2$$
Magnetic moments of $$Cr(Z=24)$$, $${Mn} (Z=25)$$ and $${Fe}(Z=26)$$, are $$x ,y , z$$. 

They are in order:
  • $$x< y< z$$
  • $$x=y< z$$
  • $$ x>y>z$$.
  • $$x=y=z$$
Which of the following elements do not show the properties characteristics of $$d$$-block elements:
  • $$Cu,Ag,Au$$
  • $$Zn,Hg,Cd$$
  • $$Sc,Ti,V$$
  • $$Fe,Co,Ni$$
The compound of vanadium has magnetic moment of $$1.73B$$. The vanadium chloride has the formula:
  • $$V{Cl}_{2}$$
  • $$V{Cl}_{3}$$
  • $$V{Cl}_{4}$$
  • $$V{Cl}_{5}$$
Lanthanoids contraction is caused due to:
  • the same effective nuclear charge from $$Ce$$ to $$Lu$$
  • the imperfect shielding of outer electrons by $$4f$$ electrons from the nuclear charge
  • the appreciable shielding of outer electrons by $$4f$$-electrons from the nuclear charge
  • the appreciable shielding of outer electrons by $$5d$$-electrons from the nuclear charge
Which of the following belongs to the actinoids series of elements?
  • $$Y$$
  • $$Ta$$
  • $$U$$
  • $$P$$
Maximum magnetic moment is shown by:
  • $${d}^{5}$$
  • $${d}^{6}$$
  • $${d}^{7}$$
  • $${d}^{8}$$
The "Spin-only" magnetic moment [in units of Bohr magneton,$$({\mu}_{B})]$$ of $${Ni}^{2+}$$ in aqueous solution would be (At. no. $$Ni=28$$):
  • $$0$$
  • $$1.73$$
  • $$2.84$$
  • $$4.90$$
Which of the following elements involves gradual filling of $$5f$$-level?
  • Lanthanoids
  • Actinoids
  • Transition metals
  • Coinage metals
In $${ Cr }_{ 2 }{ O }_{ 7 }^{ 2- }$$ every $$Cr$$ is linked to:
  • two $$O$$-atoms.
  • three $$O$$-atoms.
  • four $$O$$-atoms.
  • five $$O$$-atoms.
Which one of the following ionic species will not impart color to an aqueous solution?
  • $${Ti}^{4+}$$
  • $${Cu}^{+}$$
  • $${Zn}^{2+}$$
  • $${Cr}^{3+}$$
In the dichromate dianion:
  • four $$Cr-O$$ bonds are equivalent.
  • six $$Cr-O$$ bonds are equivalent.
  • all $$Cr-O$$ bonds are equivalent.
  • all $$Cr-O$$ bonds are non-equivalent.
Which of the following is ferromagnetic.
  • Cu, Ag, Au
  • Fe, Co, Ni
  • Zn, Cd, Hg
  • Ca, Sr, Ba
The magnetism of $$Ni^{2+}$$ ion is:
  • $$\cfrac {eh}{4\pi m}$$
  • $$ \sqrt 6 \left (\cfrac {eh}{4\pi m} \right )$$
  • $$ \sqrt 8 \left (\cfrac {eh}{4\pi m} \right )$$
  • $$ \sqrt {10} \left (\cfrac {eh}{4\pi m} \right )$$
Elements with incomplete f-subshell are called:
  • d-block elements
  • outer transition elements
  • inner transition elements
  • f-block elements
The incorrect statement in respect of chromyl chloride test is?
  • Formation of red vapour
  • Formation of leas chromate
  • Formation of carbonyl chloride
  • Liberation of chlorine
Out of the ions $$Ag^+, Co^{2+}, Ti^{4+}$$, which one will be coloured in aqueous solutions.

[Atomic no : Ag = 47, Co = 27, Ti = 22]
  • $$Ag^+$$
  • $$Co^{2+}$$
  • $$Ti^{4+}$$
  • None of these
One unpaired electron in atom contributes a magnetic moment of 1.1 BM. The magnetic moment of $$Cr$$ (Atomic number 24) is:
  • 4.6
  • 5.6
  • 6.6
  • 7.6
The ion that gives colourless compound:
  • $$Sc^{+3}$$
  • $$V^{+3}$$
  • $$Cr^{+3}$$
  • All of these
The electronic configuration of $$Co^{2+}$$ and $$Cu^{2+}$$ is $$d^7$$ and $$d^9$$ respectively,which of these ions is expecteed to be more paramagnetic ?
  • $$Co^{+2}$$
  • $$Cu^{2+}$$
  • Both have same
  • None of these
Which one of the following paramagnetic in nature?
  • $$CuCl_2$$
  • $$CaCl_2$$
  • $$CdCl_2$$
  • All of these
The chromate ion in acidic medium changes to .............. 
  • $$CrO_4^{-2}$$
  • Cr$$_3$$O$$_{10}^{-2}$$
  • Cr$$_2$$O$$_7^{-2}$$
  • none of these
Which of the following ion is not coloured ?
  • $$Ni(DMG)_2$$
  • $$[Co(SCN)_4]^{2-}$$
  • $$[Fe(H_2O)_5SCN]^{2+}$$
  • $$[Al(OH)_4]^-$$
The transition metal used in X-rays tube is :
  • $$Mo$$
  • $$Ta$$
  • $$Tc$$
  • $$Pm$$
If each one of the above ionic species is in turn kept in a magnetic field,  which  one will get attracted ?
  • $$Co^{+2}$$
  • $$Mn^{+7}$$
  • $$Sc^{+3}$$
  • $$Ti^{+4}$$
Raney nickel, which is used as a catalyst, is obtained:
  • by heating nickel tetracarbonyl
  • by grinding solid nickel
  • by treating nickelaluminium alloy with dilute $$NaOH$$
  • by treating nickelaluminium alloy with dilute $$HCl$$
Cholrine gas is produced from HCI by the addition of:
  • $$K_2SO_4$$
  • $$KCl$$
  • $$KNO_3$$
  • $$KMnO_4$$
Most copper $$(I)$$ compounds are found to be colourless. This is due to :
  • presence of low oxidation state of copper
  • completely filled d-level in $$Cu(I)$$
  • diamagnetic nature of the compound
  • high polarizability of $$Cu(I)$$ ion
The metal capable of gaining as well as losing an electron is:
  • Hg
  • Ca
  • Ag
  • Au
In the general electronic configuration,
$$(n-2)f^{1-14} (n-1)d^{01} ns^2$$ (where n = 7) the configuration will be of:
  • lanthenides
  • actinides
  • transition elements
  • none
Which of the following is not a heavy metal?
  • $$Cu$$
  • $$Hg$$
  • $$Pb$$
  • $$K$$
The decreasing order of solubility of silver halide is:
  • $$AgI > AgBr > AgCl > AgF$$
  • $$AgF > AgCl > AgBr > AgI$$
  • $$AgCl > AgF > AgBr > AgI$$
  • $$AgBr > AgF > AgI > AgCl$$
The tendency towards complex formation is maximum in:
  • s-block elements
  • p-block elements
  • d-block elements
  • none of the above
Which of the following ions is colourless in solution?
  • $${V}^{3+}$$
  • $${Cr}^{3+}$$
  • $${Co}^{2+}$$
  • $${Sc}^{3+}$$
The pair that referred as 'chemical twins' is:
  • Ac, Cf
  • Hf, Ta
  • Tc, Re
  • La, Ac
 Generally transition elements and their salts are coloured due to presence of___________
  • coloured compounds and ions
  • coloured anions and cations
  • coloured particles and ions
  • unpaired electrons
Which of the following is coloured compound?
  • $$CuF_2$$
  • $$CuI$$
  • $$NaCl$$
  • $$MgCl_2$$
Select a ferromagnetic material from the following?
  • Dioxygen
  • Chromium (IV) oxide
  • Benzene
  • Dihydrogen monoxide
Most basic hydroxide among the following is:
  • $$Lu(OH)_3$$
  • $$Eu(OH)_3$$
  • $$Yb(OH)_3$$
  • $$Ce(OH)_3$$
Which one of the following metal ion is coloured?
  • $$Ti^{2+}$$
  • $$Cu^+$$
  • $$V^{4+}$$
  • $$Zn^{2+}$$
The point of dissimilarity between lanthanides and actinides is:
  • three outermost shells are partially filled
  • they show oxidation of $$+3$$ ( common)
  • they are called inner transition elements
  • they are radioactive in nature
Which of the following commonly forms an ionic compounds as a $$-1$$ anion?
  • $$\displaystyle C$$
  • $$\displaystyle N$$
  • $$\displaystyle O$$
  • $$\displaystyle Fe$$
  • $$\displaystyle Ne$$
The spin only magnetic moment of $$Ni^{2+}$$ (in B.M.) in aqueous solution will be:
  • $$1.73$$
  • $$2.82$$
  • $$3.42$$
  • $$2.25$$
Copper (II) sulfate solution is:
  • red
  • purple
  • orange
  • green
  • blue
Platinum, Palladium and Iridium are called noble metals because:
  • Alfred Nobel discovered them
  • they are shining lustrous and pleasing to look at
  • they are found in native state
  • they are inert towards many common reagents
Which of the following ions has the maximum magnetic moment?
  • $$Co^{2+}$$
  • $$Fe^{3+}$$
  • $$Sc^{3+}$$
  • $$Cr^{+3}$$
Are the most readily oxidized elements within a given period
  • 3d Transition metals
  • Alkali metals
  • Halogens
  • Noble gases
  • Actinides
Which of the following is not an actinoid?
  • $$Curium (Z = 96)$$
  • $$Californium (Z = 98)$$
  • $$Uranium (Z = 92)$$
  • $$Terbium (Z = 65)$$
Identify the pairs of ions possessing equal spin only magnetic moments:
  • $$Co^{-2}, Ni^{+2}$$
  • $$Co^{+2}, Cr^{+3}$$
  • $$Fe^{+2}, Fe^{+3}$$
  • $$Fe^{+2}, Cr^{+3}$$
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